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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Difference between income tax provision computed at the statutory Federal income tax rate and financial statement income tax |  |  |  |  |  |  |  |  |  |  |
Provision at Federal rate of 21% |  |  |  |  |  |  |  |  | $ 17,925 | $ 22,202 | $ 18,267
State income taxes, net of Federal impact |  |  |  |  |  |  |  |  | 3,430 | 2,792 | 2,985
Research and experimentation credits |  |  |  |  |  |  |  |  | (2,705) | (3,314) | (4,040)
Stock award vesting |  |  |  |  |  |  |  |  | (540) | (3,661) | (1,513)
Tax uncertainties |  |  |  |  |  |  |  |  | (403) | (56) | (122)
Section 199 manufacturing deduction |  |  |  |  |  |  |  |  |  |  | 168
Section 162(m) compensation limitation |  |  |  |  |  |  |  |  | 4,494 | 978 | 951
Foreign rate differential |  |  |  |  |  |  |  |  | 462 | 930 | 1,238
Valuation allowance for deferred tax assets |  |  |  |  |  |  |  |  | 1,002 | (495) | (177)
Withholding Tax |  |  |  |  |  |  |  |  | 2,572 | 2,408 | 2,070
Other impact of foreign operations |  |  |  |  |  |  |  |  | 621 | 227 | 685
Statutory rate change |  |  |  |  |  |  |  |  | 71 | (10) | (87)
Other |  |  |  |  |  |  |  |  | (284) | 952 | 432
Total income tax provision | $ 6,423 | $ 9,176 | $ 3,884 | $ 7,162 | $ 1,633 | $ 7,262 | $ 7,458 | $ 6,600 | $ 26,645 | $ 22,953 | $ 20,857

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other impacts of foreign operations. + References No definition available. + Details
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